Ok so I've downloaded some new icons |
Are you referring to an IconPackage, or miscellaneous icons?
If they are Icon Packages, I would suggest the following steps:
1 - Start Icon Packager > use Tools\Restore all Icons > click Yes to verify > click OK to apply
2 - Repeat step #1 for both the Rebuild Icon Cache, and Repair Icon Images options under the same Tools menu
3 - Reboot machine
4 - Double-click the Icon Package downloaded file to install and invoke Icon Packager > Apply the new package > verify complete application of package.
If you are instead, referring to miscellaneous icons, you can use the View\Package Builder to assemble the new package > save the package with a new name > navigate to the location you saved it to > double-click the new package to install and apply.
Note - these steps all assume you are running either the enhanced version of IconPackager, or the free version inside the 30 day limit.
I hope this helps.